Syntax Error on Drawing Script (JavaScript)
I'm writing a program for my class (javascript) that simply draws lines on a canvas. And uses the alt key to draw white and give the appearance of it being 'Erased'. I finished the code, but i'm getting a syntax error and can't see what i'm doing wrong. Can you guys please help?
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>Simple Drawing Program</title>
(Assignment 7a)<br /><hr />
<style type = "text/css">
#canvas { width: 400px;
border: 1px solid #999999;
border-collapse: collapse}
td { width: 4px;
height: 4px }
th.key { font-family: arial, helvetica, sans-serif;开发者_如何学C
font-size: 12px;
border-bottom: 1px solid #999999 }
</style>
<script type = "text/javascript">
<!--
// initialization inserts cells into the table
function createCanvas ()
var side = 100;
var tbody = document.getElementById ("tablebody");
for (var i = 0; i < side; i++)
{
var row = document.createElement ("tr");
for (var j = 0; j < side; j++)
{
var cell = document.createElement ("td");
cell.onmousemove = processMouseMove;
row.appendChild (cell);
}
tbody.appendChild (row);
}
}
// draws when mouse is moved by turning cells red or blue
function processMouseMove (event) {
// get IE event
if (! event) {event = window.event;}
// turn cell blue if Ctrl key is pressed
if (event.ctrlKey) {this.style.backgroundColor = "blue";}
// turn cell red if Shiftkey is pressed
if (event.shiftKey) {this.style.backgroundColor = "red";}
// turn cell white if Altkey is pressed
if (event.altKey) {this.style.backgroundColor = "white";}
}
// -->
</script>
</head> <body onload = "createCanvas()">
<table id ="canvas" class="canvas"><tbody id="tablebody">
<tr><th class="key" colspan="1OO">Hold <tt>ctrl</tt>
to draw blue. Hold <tt>shift</tt> to draw red. Hold <tt>alt</tt>to erase lines</th></tr>
</tbody></table>
</body> </html>
the error is given on the line 'var side = 100;'
You are missing the { to start the function...
function createCanvas () {
加载中,请稍侯......
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